1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <stddef.h> 3 #include <linux/bpf.h> 4 #include <bpf/bpf_helpers.h> 5 6 struct Small { 7 int x; 8 }; 9 10 struct Big { 11 int x; 12 int y; 13 }; 14 15 __noinline int foo(const struct Big *big) 16 { 17 if (!big) 18 return 0; 19 20 return bpf_get_prandom_u32() < big->y; 21 } 22 23 SEC("cgroup_skb/ingress") 24 int test_cls(struct __sk_buff *skb) 25 { 26 const struct Small small = {.x = skb->len }; 27 28 return foo((struct Big *)&small) ? 1 : 0; 29 } 30